The following un-solicited report
was provided by one of our customers. This test was made using a
professional WYKO phase-shifting interferometer. For this test, he set
up the prism in an f/7.5 converging beam, to accurately measure the total
wavefront quality of the diagonal when used in an actual f/7.5 telescope.
This means that the report includes the effect of the very small amount of
spherical overcorrection that results from using a prism in a telescope's
converging beam. This report is high testimony to the quality image
that the Baader Amici delivers. In use, the only telltale sign of the
amici roof edge being a single very faint diffraction spike on the very
brightest stars (fainter than the diffraction seen from the spider vane of a
newtonian).

"Here is the report I promised
you. I've included several Wyko "phasemaps", these are 2D maps of the
wavefront using false color. The most important one is the f/7.2 data
set trimmed to f/7.5. You'll notice that the wavefront error is 0.015
rms and 0.094 p-v. Very nice numbers. Of course, the actual
numbers are probably even better because of the roof diffraction effect.
With the roof line masked off, the numbers are 0.012 rms and 0.057 p-v (1/80
wave rms, 1/18 wave peak to valley). This data more accurately
describes the smooth wavefront and is indicative of how the prism will
perform. I would say that except for the diffraction spike this prism
will "disappear" in use."